Kalshi's most traded NFL Week 1 market is Dallas Cowboys at New York Giants, scheduled for Sunday at 8:20 p.m. ET. The matchup tops the exchange's opening weekend board. Separately, Kalshi and Polymarket traders are pricing Buffalo Bills vs. Houston Texans as the tightest Week 1 game. Both platforms are listing player prop contracts alongside game outcomes. The Cowboys-Giants market leads the Week 1 slate in user activity on Kalshi.

The Cowboys-Giants lead tells little about actual liquidity. Kalshi's most traded tag is a user-activity label, not disclosed volume or open interest. Traders need depth data to price slippage, and Kalshi does not publish per-market figures like Novig's $125 million debut benchmark. Without that benchmark, the most traded ranking is marketing, not actionable intelligence. The Bills-Texas tight pricing on both Kalshi and Polymarket is more useful, it shows convergent expectations across venues. For serious operators, the takeaway is what remains hidden: which market maker supplied that tight spread, and whether it held through kickoff. Until platforms standardize real-time depth reporting, traders are choosing between headline labels and tradeable books.